Take a look at my civilization and if you think you can still beat it, let me know. Bad start so only managed 17 colonies by turn 27. Didn't play that optimally either. With a better start I could have done much better. About to get the rest of the planets on the map (may have overbuilt colony ships though). Going for Malevolence level 5 (free big ship on each planet). With 30-40 colonies, this means 30-40 free extra ships that I was going to ball up into fleets and attack.
Oh yeah, I also have Gaia Vortex and Hyperion Matrix and Hives on each planet so the average production per planet is 40 research or 40-50 manufacturing depending on type, despite having an average of 2 pop on each planet. Teching everything in 1-2 turns.
My population is 4x yours in part because I have 4x the number of planets. Also, the Malevolence level 3 ideology (free transports) means an automatic 30 population, which is HUGE in the early game.
Galactic Civilizations III multiplayer basically boils down to who can get Malevolence level 3 and level 5 invasion ideologies. The person who can colonize enough planets to get there automatically wins.
Thanks,
Marigold.